How to make water wall effect?
This is possible using a Fluid simulation - although it does take a bit of trial and error to get the settings right whilst still being able to keep the simulation resolution low enough to make it practical.



To set up the scene you need the Fluid domain and the 'nozzles' to spray the water. The fluid domain should be kept as small as possible to reduce the computation for the simulation. Note that if you resize the domain you should always 'Apply Scale' for the resizing to take effect on the simulation cells (otherwise the simulation will be distorted).

I used the 'Shell' setting for the Inflow nozzles. This allows them to be defined as simple plane faces rather than a volume within the simulation. The sizing and orientation of the nozzles is quite significant - they need to be big enough in relation to the fluid 'resolution' and the direction of the 'Inflow' should approximately match the orientation of those faces.




The higher the Resolution of the fluid simulation the better - although larger values will significantly affect the simulation bake time. However, the resolution must be high enough in relation to your inflow nozzles so that each contributes a solid stream of fluid. If the inflow is intermittent, try larger nozzles, reorient the nozzles to match the flow direction, or increase the resolution.

Once you have the general flow working you will likely need to adjust the Inflow speed and direction (by changing the X,Y,Z Velocity settings) to adjust the flow. This needs to be high enough to produce enough fluid to cover the surface without being too high to cause splashing (which will hit the edges of your domain and look ugly). One trick to prevent splashing is to increase the compressibility of the fluid, allowing the fluid to spread into an area rather than bounce off the existing fluid (technically not physically accurate for water but produces better effects without having to drastically increase the domain resolution).



For simplicity I used the back face of the domain as the 'surface' for the water wall rather than a fluid Obstacle. I added the 'fake' glass pane behind the domain for the final render - it doesn’t interact with the simulation. This simplifies the simulation as there are no complications of the collision surface not aligning with the cells of the simulation. Add an Outflow mesh to the bottom of the domain to drain away the fluid. Don't forget to set your domain mesh to 'Smooth' (or you'll get angular fluid).



Bake the simulation and assign suitable fluid material (essentially just slightly coloured glass).

Here's the final result baked with a resolution of 300 :



Blend file included